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Risk map is one of the important ways to represent the results of risk analysis.Usually,different cartography symbols and color were used to show level.Traditionally,single variant cartography symbols and color.But there is uncertainty in the risk.In order to show the both risk levels and uncertain levels information in one map.Bivariate thematic mapping were used in this paper.A bivariate map displays two variables on a single map by combining two different sets of graphic symbols or colors.